I am bagged and drive mine pretty much daily. As far as reliable it all depends on the equipment used and the installation. I am not on bags but cylinders since there is no room for an actual bag. The ride defiantly has a sweet spot.

As far as valves i am running 8-SMC valves and 2-viair 380 compressors. Since i do not need the volume of air i use a 3 gallon tank with 200psi of reserve air. I can lift and dump the car 3 times before i refill which is at 165 psi. As far as having to wait in the morning i have no leaks and am on the road in 15 seconds of starting the car (just long enough to hit the switches). I have had a line blow out of a fitting when i first did the install 3 years ago. The fitting was defective and this happened within the first couple drives. Front right corner dropped to the ground but stopped and fixed it on the side of the road. Always keep a couple union fittings and a couple spare feet of airline in case something does happen. My car has been driven to Chicago, Savannah, and Nashville all on the air ride with no issues.

If your not sure what your looking at see if someone locally who i good with s-10's can come with you to check out the quality of work. Even though the truck may be show quality it could be a hack in a candy wrapper.